Most people around the world now greet each other by shaking hands, but some cultures use other greetings as well, such as the Japanese, who prefer to bow.
Next today, we've told you how the demilitarize zone that separates North and South Korea is actually one of the most heavily militarized borders on earth.
And it's where the American leader received a large and warm welcome when he spoke at the world's biggest cricket stadium in the Indian city of Ahmedabad.